Familial HDL deficiency
is a rare genetic condition that causes low levels of “good” cholesterol (HDL) in the blood. HDL helps remove excess cholesterol and fats from your blood. People with familial HDL deficiency may develop cardiovascular disease at a relatively young age, often before age 50. This condition is caused by changes in the ABCA1
or the APOA1
genes. The deficiency is passed through families in an autosomal dominant
More severely reduced levels of HDL in the blood is a characteristic feature of a related disorder called Tangier disease.